I have previously written about my favorite stock photo resources. I've also posted about how to find Google images you can actually use for commercial use. In that same vein I'd like to present Photopin, a new resource that may be useful in your search for budget-friendly stock photos.
The photos are lifted from Flickr and are, by and large, Creative Commons licensed. This type of license allows free use but they'll need an attribution link. (If you'd like to pay for the photos instead of just linking to them, you have the option to do that through Fotolia instead.)
Having this many easily searchable Creative Commons images at your fingertips will be immensely useful if you are a blog writer. If, however, you would like to use the images in your eLearning, you will probably need images labeled for commercial use. No worries. After entering your search term and clicking Search, you can select Commercial from the License Type area in the upper left.
A word of caution: be sure to re-select the Commercial option for each search you do, as the choice does not stick between searches. Additionally, make sure that you follow the Flickr link for each image to check out the full License details, located in the lower right of the Flickr page.